Journal
JOURNAL OF CO2 UTILIZATION
Volume 41, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jcou.2020.101232
Keywords
Catalyst; Extraction; Palladium; Polymer; Supercritical fluid
Funding
- ANR [ANR-17-MIN2-0004-01]
- ADEME [1802C0033]
- Federal Ministry of Education and Research [033RU009A, 033RU009B]
- CCCDI-UEFISCDI (COFUND-ERANET-ERAMIN-SUPERMET within PNCDI III) [48/2018]
- Horizon 2020 program of the European Union
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Precious metals, in particular palladium (Pd), have a wide range of daily applications, from automotive catalysts to fine chemistry production. Nevertheless, these metals are relatively rare and highly expensive, considering their massive industrial utilization. In the last decades, different recycling methods have been explored. Nowadays, the most applied methods, namely pyroand/or hydrometallurgy, involve energy-intensive processes and/or the generation of large amounts of effluents to be treated. Thus, the development of a more sustainable recycling process of precious metals is highly desirable. In the present work, we introduce a sustainable process based on the use of a green solvent, supercritical CO2, operated under mild conditions (P = 25 MPa and T = 40 degrees C). The extraction process is possible thanks to the addition of CO2-soluble complexing polymers bearing pyridine units. The proposed method leads to the extraction of more than 70 % of Pd from an aluminosilica-supported catalyst.
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